Heat olive oil in a small skillet over medium heat. Add onions and cook until lightly brown, about 10 minutes.
1 tablespoon olive oil, ½ large yellow onion
While onions are cooking, put the spinach in a large microwave safe bowl and microwave a minute or two at a time until soft. Drain the liquid from the spinach.
10-12 ounces fresh spinach, roughly chopped
In a mixing bowl, combine all ingredients until well blended. Chill for an hour or more. Adjust seasoning before serving.
½ cup plain Greek yogurt, ½ cup mayonnaise, 3 tablespoons chopped fresh parsley, ¼ teaspoon hot sauce, salt and pepper to taste
Notes
If using frozen spinach, partially thaw in the microwave for a few minutes. Drain then continue with the recipe.